Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
DELTA · FLIGHT DL 1021
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
DL 1021 · ATL → GSP
departs 5:55 PM ET · arrives 6:55 PM ET
Forecast issued Wed 11:00 PM ET · 67h before departure
Watch this flight
Other days
Today 22%
Fri 10/2 24%
Sat 10/3
Sun 10/4 18%
Mon 10/5 19%
Tue 10/6 11%
Wed 10/7 11%
Odds over time
Arrive at GSP more than 15 minutes late?
27%
chance · ±3 pts
+15 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
27%
Leave 15+ late
26%
Arrive 1h+ late
8%
Cancelled
2%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.8d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at GSP more than 15 minutes late?
Calm-weather odds: 9% · changed +15 pts in 24h
+15 pts
27%
Yes 27%
No 73%
Leave ATL more than 15 minutes late?
Calm-weather odds: 9% · changed +15 pts in 24h
+15 pts
26%
Yes 26%
No 74%
Arrive at GSP more than an hour late?
Calm-weather odds: 2% · changed +4 pts in 24h
+4 pts
8%
Yes 8%
No 92%
Cancelled?
Calm-weather odds: <1% · changed +1 pt in 24h
+1 pt
2%
Yes 2%
No 98%
How late will it get to GSP?
On time or early
71%
15–30 min late
7%
30 min–1 hour late
12%
1–2 hours late
5%
Over 2 hours late
2%
Cancelled
2%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 300 ft, 0.5 in of rain forecast at ATL that day
↑
Cloud base down to 300 ft, visibility down to 2 mi, 0.6 in of rain forecast at GSP that day
↑
5pm departures from ATL are often late
↓
ATL usually runs smoothly
↓
GSP usually runs smoothly
Weather at each end
ATL (origin)
Gusts 10 kt Ceiling 300 ft Visibility 4 mi Precip 0.46 in
GSP (destination)
Gusts 16 kt Ceiling 300 ft Visibility 2 mi Precip 0.63 in
How this resolves
Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.
Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.